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Letters Patent No. 70,872, dated November 12, 1867.

C. .K. MARSHALL, OF NEW ORLEANS, LOUISIANA.

IMPROVEMENT IN PREPARING WOOD TO BE USED IN THE MANUFACTURE OI PAPER ANDFOB OTHER PURPOSES.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, O. K. MARSHALL, of New Orleans, parish of Orleans,and State of Louisiana, have invented a new and'useful Article ofManufacture and Commerce, which I term Ligninc Flour, and which can beadvantageously used as the chief ingredient in the manufacture of paper;and I do hereby declare that the following is a full, clear, and exactdescription of the same.

The nature of my invention consists in the production of a new articleof manufacture and commerce which Iterm lignine flour.

In order to enable others skilled in the arts to which my invention isapplicable, and in which it can be advantageously used, thoroughly tounderstand the same, I will proceed fully to describe how a fine qualityof the flour can readily be obtained, as well as the method of using theflour when the same is employed, as it can successfully be, as the chiefingredient in the manufacture of paper.

To obtain the flour, I take chips of the planing machine, or theordinary saw-dust, articles in themselves of no value, and grind them toa powder in a burr or steel-mill; a flour as fine can thus be procuredas that pro. duced by bolting wheat. -When the chips and saw-dust to beground are obtained from oak or other hard wood, it may be necessary, asalso advantageous, in order properly to dry them, to subject the same toa slightheat.

This, however, is entirely unnecessary when the material to be used hasbeen obtained from any of the species of-pine, as it can be thoroughlydried and properlyprepared without resort being had to the heatingprocess- In some cases, as, for instance, in the manufacture of whitepaper, it may be necessary to bleach. This can readily be done byplacing the material in a suitable vessel, and boiling the same for ashort period. When the chips and saw-dust are obtained from a wood ofdark texture, such as walnut, it may be necessary, in order critirely tofree the same of coloring matter, to add to the water in which thematerial is to be boiled a small quantity of chloride of lime.- It is amatter of entire indifl'erence whether the bleaching is done before orafter grinding, the result will be precisely the same, I

The operation of grinding the chips and saw-dust, as-well as dischargingthe flour, is much facilitated by slightly moistening the material whilepassing through the mill. This can. readily be done by attaching to themill a small water-jet or spout.

I have thus fully explained one method of obtaining the lignine flour;butit will readily occur to any one skilled in the art, that an equallygood article might be obtained by pulverizing, as also by other means.

In order to manufacture paper, I take about seventy per cent. of theflour, prepared as above described, and mix the same with about thirtyper cent. of pa er-pulp, such as is obtained fromlinen, cotton, hemp, orany other fibrous vegetable matter. Thoroughly mix the pulp and flourtogether; subject the same to pressure and heat, in every regard as youdo the ordinary pulp in the manufacture of paper, and a good, durable,and cheap article of paper is obtained.

Having thus fully described my invention, what I claim therein as new,and desire to secure by Letters Patcnt, is--- 1. As a new article ofmanufacture and commerce, wood-chips and saw-dust, reduced to a fineflour or powder, substantially as described.

2. The use of the flour, obtained as above described, as an ingredientin the manufacture of paper.

In testimony whereof I have signed myname to this specification in thepresence of two subscribing witnesses.

O. K. MARSHALL.

i nesses:

JOHN S. HOLLINGSIIEAD, Jenn D. BLoon.

